Worm.Win32.RETADUP.NH


 ALIASES:

Troj/AutoIt-CFN (SOPHOS_LITE); Win32/AutoHK.NAP trojan (NOD32)

 PLATFORM:

Windows

 OVERALL RISK RATING:
 DAMAGE POTENTIAL:
 DISTRIBUTION POTENTIAL:
 REPORTED INFECTION:
 INFORMATION EXPOSURE:

  • Threat Type: Worm

  • Destructiveness: No

  • Encrypted: Yes

  • In the wild: Yes

  OVERVIEW

Infection Channel:

Dropped by other malware, Downloaded from the Internet

This Worm arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

It connects to a website to send and receive information.

  TECHNICAL DETAILS

File Size:

35,422 bytes

File Type:

Other

Memory Resident:

Yes

Initial Samples Received Date:

13 Mar 2018

Payload:

Connects to URLs/IPs, Adds scheduled task

Arrival Details

This Worm arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

Installation

This Worm creates the following folders:

  • {Drive Letter}:\{Infected Folder}\{Random 21 Characters}

Autostart Technique

This Worm adds the following registry entries to enable its automatic execution at every system startup:

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
{Random 21 Characters} = {Drive Letter}:\{Infected Folder}\{Random 21 Characters}\{Random 21 Characters}.exe {Drive Letter}:\{Infected Folder}\{Random 21 Characters}\{Random 21 Characters}.txt

It drops the following files:

  • {Drive Letter}:\{Infected Folder}\{Infected Folder Name} copy {Random 3 Characters}.lnk
  • {Drive Letter}:\{Infected Folder}\{Random 21 Characters}\{Random 21 Characters}.exe

Propagation

This Worm drops the following copy of itself in all physical and removable drives:

  • {Drive Letter}:\{Infected Folder}\{Random 21 Characters}\{Random 21 Characters}.txt

Backdoor Routine

This Worm connects to the following websites to send and receive information:

  • http://newalpha.{BLOCKED}oob.com:9898
  • http://superalpha.{BLOCKED}age.com:9898
  • http://superalpha.{BLOCKED}ersage.com:3333
  • http://newalpha.{BLOCKED}gamezer.com:9333
  • http://newalpha.{BLOCKED}oob.com:9999
  • http://noobminer.{BLOCKED}vm.com:9898

Other Details

This Worm checks for the presence of the following process(es):

  • streamer.exe
  • liveworker.exe
  • superchecker.exe
  • speedup.exe
  • nova.exe
  • cpuchecker.exe
  • cpuchecker32.exe

It does the following:

  • It accepts the following arguments from its CNC:
    • update-
    • download-
    • script-
    • updateself-
  • Enumerates instances of:
    • AntiVirusProduct
    • Win32_OperatingSystem

It adds the following scheduled tasks:

  • Task Name: {Random 21 Characters}
    Schedule: Every 1 minute
    Task to be executed: "{Drive Letter}:\{Infected Folder}\{Random 21 Characters}\{Random 21 Characters}.exe {Drive Letter}:\{Infected Folder}\{Random 21 Characters}\{Random 21 Characters}.txt"

  SOLUTION

Minimum Scan Engine:

9.850

FIRST VSAPI PATTERN FILE:

14.840.05

FIRST VSAPI PATTERN DATE:

27 Feb 2019

VSAPI OPR PATTERN File:

14.841.00

VSAPI OPR PATTERN Date:

28 Feb 2019

Step 1

Before doing any scans, Windows XP, Windows Vista, and Windows 7 users must disable System Restore to allow full scanning of their computers.

Step 2

Note that not all files, folders, and registry keys and entries are installed on your computer during this malware's/spyware's/grayware's execution. This may be due to incomplete installation or other operating system conditions. If you do not find the same files/folders/registry information, please proceed to the next step.

Step 3

Restart in Safe Mode

[ Learn More ]

Step 4

Delete this registry value

[ Learn More ]

Important: Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this step only if you know how or you can ask assistance from your system administrator. Else, check this Microsoft article first before modifying your computer's registry.

  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
    • {Random 21 Characters} = {Drive Letter}:\{Infected Folder}\{Random 21 Characters}\{Random 21 Characters}.exe {Drive Letter}:\{Infected Folder}\{Random 21 Characters}\{Random 21 Characters}.txt

Step 5

Deleting Scheduled Tasks

The following {Task Name} - {Task to be run} listed should be used in the steps identified below:

  • {Random 21 Characters} - {Drive Letter}:\{Infected Folder}\{Random 21 Characters}\{Random 21 Characters}.exe {Drive Letter}:\{Infected Folder}\{Random 21 Characters}\{Random 21 Characters}.txt

For Windows 2000, Windows XP, and Windows Server 2003:

  1. Open the Windows Scheduled Tasks. Click Start>Programs>Accessories>
    System Tools>Scheduled Tasks.
  2. Locate each {Task Name} values listed above in the Name column.
  3. Right-click on the said file(s) with the aforementioned value.
  4. Click on Properties. In the Run field, check for the listed {Task to be run}.
  5. If the strings match the list above, delete the task.

For Windows Vista, Windows 7, Windows Server 2008, Windows 8, Windows 8.1, and Windows Server 2012:

  1. Open the Windows Task Scheduler. To do this:
    • On Windows Vista, Windows 7, and Windows Server 2008, click Start, type taskschd.msc in the Search input field, then press Enter.
    • On Windows 8, Windows 8.1, and Windows Server 2012, right-click on the lower left corner of the screen, click Run, type taskschd.msc, then press Enter.
  2. In the left panel, click Task Scheduler Library.
  3. In the upper-middle panel, locate each {Task Name} values listed above in the Name column.
  4. In the lower-middle panel, click the Actions tab. In the Details column, check for the {Task to be run} string.
  5. If the said string is found, delete the task.

Step 6

Search and delete this folder

[ Learn More ]
Please make sure you check the Search Hidden Files and Folders checkbox in the More advanced options option to include all hidden folders in the search result.  {Drive Letter}:\{Infected Folder}\{Random 21 Characters}

Step 7

Search and delete these files

[ Learn More ]
There may be some files that are hidden. Please make sure you check the Search Hidden Files and Folders checkbox in the "More advanced options" option to include all hidden files and folders in the search result.
  • {Drive Letter}:\{Infected Folder}\{Infected Folder Name} copy {Random 3 Characters}.lnk

Step 8

Restart in normal mode and scan your computer with your Trend Micro product for files detected as Worm.Win32.RETADUP.NH. If the detected files have already been cleaned, deleted, or quarantined by your Trend Micro product, no further step is required. You may opt to simply delete the quarantined files. Please check this Knowledge Base page for more information.


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